If you're having trouble making a transaction on polkadot.js, it can be useful to switch to another network node and try again.

To do this, simply click on the current network on the top left. 

You will see two nodes by different hosts. Simply select the other node here, and then click the Switch button on top. 

You can also use the same panel to switch to a completely different network:

Polkadot.js

On polkadot.js, click on the currently selected network on the top left. In the case below, we currently are on the Polkadot network. 

In the panel that opens, select the network you want to switch to. We're selecting Kusama. There are two nodes available and it doesn't matter which one you choose.

Select one of the nodes and then click on the Switch button.  

You are now on the Kusama network and can access your KSM accounts here.  

You can switch back to Polkadot in the same way. 

Polkadot{.js} Browser Plugin

In the browser extension, click on the gear wheel to open the Settings. 

Then select Kusama under "Display address format for" 

You will see the address format change immediately. While it started with a 1 for Polkadot (see image above) your addresses now start with a letter, which is the Kusama format. 

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